why block size is different when I use sqoop

[#1]

When I import data using sqoop, the block size is 256MB. But, when I import data not using sqoop, the block size is 128MB. The setting "dfs.blocksize" is of course 128MB. I wonder why it is only 256MB when I use sqoop. I wonder if this is a configuration problem in sqoop or hdfs configuration problem.

sqoop import
  --connect jdbc:oracle:thin:@$127.0.0.1:1521:SRDB \
  --username abc \
  --password  \
  --targetdir \
  --query \
  --fields-terminated-by \
  --num-mappers \
  --split-by

[#2]

Here are the issues I am facing.

First image is when i used sqoop. Second one is when i did not use sqoop.